Low-power sub-1-V compact bandgap reference for passive RFID tags

A sub-1-V bandgap used for passive radio-frequency identification (RFID) tags is presented. The bandgap circuit needs to work under a low supply voltage in the power starving application environment. In the literature, there are lots of low-voltage structures with large current to realise high performance. However, they are not suitable for low-cost RFID tags, so a low-power sub-1-V bandgap is realised. First, the basic structure of the proposed compact low-voltage supply low-power bandgap reference is shown. Secondly, a circuit analysis is presented and some detail considerations in the design processing are given. Finally, the chip is fabricated in a 0.13 μm mixed signal CMOS process. This low-power sub-1-V bandgap can work well at 0.85 V and at only needs 2.5 μA current at the 1.2 V supply voltage.